Now docker image is built from https://pagure.io/fedora-kiwi-descriptions/blob/rawhide/f/teams/cloud/container.xml of https://pagure.io/fedora-kiwi-descriptions project.

Ref:
https://discussion.fedoraproject.org/t/is-kiwi-used-for-fedora-42-official-image-builds/142373/2
https://fedoraproject.org/wiki/Changes/KiwiBuiltCloudImages